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Re: [Xen-users] decreasing Xenmon overhead

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Subject: Re: [Xen-users] decreasing Xenmon overhead
From: Mark Williamson <mark.williamson@xxxxxxxxxxxx>
Date: Wed, 30 May 2007 13:10:39 +0100
Cc: "Petersson, Mats" <Mats.Petersson@xxxxxxx>, Ashish Gupta <ashishgup@xxxxxxxxx>
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> > Are there ways I can drastically reduce this overhead ? I
> > read somwhere about event overhead, using event masks and
> > python overhead,  but am not really sure how to use this
> > information to reduce the overhead.
> Perhaps write a C-program rather than using Python to fetch/format the
> information? That shouls improve it, but I guess you'll still see a
> noticable overhead if you sample the information every 100ms.

xentrace (for instance) just logs out data to a file, and does the formatting 
offline using a python script.  This is also a useful approach if you're 
getting data out at a high bandwidth.


Dave: Just a question. What use is a unicyle with no seat?  And no pedals!
Mark: To answer a question with a question: What use is a skateboard?
Dave: Skateboards have wheels.
Mark: My wheel has a wheel!

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